which phrase best defines a galaxy?\ntightly packed group of older stars\nlarge grouping of more than two…

which phrase best defines a galaxy?\ntightly packed group of older stars\nlarge grouping of more than two stars\nloose, disorganized star cluster held together by gravity\nlarge collection of stars, gas, and dust held together by gravity
Answer
Brief Explanations:
A galaxy is a massive system consisting of stars, gas, and dust bound together by gravity. The first three options are too limited in description. The last option correctly encompasses the components and the binding - force of a galaxy.
Answer:
large collection of stars, gas, and dust held together by gravity